MS British Library Add. 11639 is a 13th-century Hebrew liturgical (plus) miscellany from north France which cannot have been completed earlier than 1276. It includes a piyyut of expostulation against persecution of Jews to which is appended, by the same scribe, a note that it is to be sung to the melody of a French vadurie (love-song), the beginning of which he cites. This has been identified as a composition of Moniot de Paris, whose literary activity probably began after 1250. Substance and structure indicate that the Hebrew was modelled on the French text as well as adopting its music; and it is here contended that it reflects disillusionment under Louis IX regarding Franco-Jewish co-existence in the aftermath of the Paris disputation of 1240, and may allude indirectly to the emigration of R. Yehi'el, the Jewish spokesman.